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Re: {OTish} Power consumption
- Subject: Re: {OTish} Power consumption
- From: "David Buckley" <db@xxxxxxxxxxx>
- Date: Wed, 09 Jun 2004 06:10:32 -0000
--- In ukha_d@xxxxxxx, "Rodney Hall" <rmh@r...> wrote:
> Those figures are calculated by *measuring* the consumption
> with an ammeter.
Sadly, measuring current to a PC with any old ammeter is a waste of
time. Normal ammeters assume that the current waveform is a sine
wave, measure average current, and display it.
PC and monitor switch mode power supplies do not draw current like a
sine wave, but more like a spike. Thus normal average reading
meters lie.
You need a "true RMS current" ammeter. These display the correct
current irrespective of waveform. They also cost more than non-true
RMS reading meters.
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